Heating device



Sept. 12, .1933. K. K. MORTERUD HEATING DEVICE Filed May 11, 1935 l M JW Patented Sept. 12, 1933 UNITEDST N.es P ArENr f`*ol-r1 ca Y 1,926,494 nEATIN'G yDvIoE l KnutiKristoffer Morterud, Oslo, Norway Application Mayu, 193e. serial'Nbgcvoos claims.v (o1. 2574-224) The present invention relates to a heating device for theV transmission of heat to liquids passing along the exterior surface of pressure y Steam tubes, and more particularly the inven- 5 tion relates to heating devices of the kind speciiied in whichlthe -pressure steam heating tubes have an elongated cross section with substantially flat parallel` side surfaces.

In accordance with the invention a number Vof these pressure steam heating tubes are placed with their substantially flat side surfaces parallel to and a short distance from each other, the set of `tubesbeing enclosed in a pressure resisting chamber orcasing, through which the liquid to be heated passes.

Further, in accordance with the invention the said pressure steam heating tubes are provided between their flat parallel side surfaces with interior longitudinal ribs extending between the said surfaces, other longitudinal ribs being placed between the opposed exterior side surfaces of adjacent heating tubes and between the nat side surfaces lof the outer tubes-and the Yinterior wall of the pressure resisting casing en- 5 closing the same, saidA ribs serving Ato reinforce the rlat tube walls against exterior and interior pressure. L

The pressure resisting casing may have a .square or rectangular cross section, but in ac- 0 cordance with one preferred embodiment of the invention the pressure resisting casing has a circular cross section, and in that case in accordance with the present invention. the pressure resisting casing is provided `with two substan- 5" tially flat interior surfaces parallel to and adjacent the exterior ,surfaces of the two outer pressure steam heating tubes. Y i

On the drawing:

an embodiment ofthe 'side surfaces. The steam heating tubes 2 are interconnected at the top and at the bottom in a manner well known per se bymeans of short Y tubes 3, 4, forming connecting channels for the i intake and outlet of pressure steam. The con- 5 nection between the steam` heating tubes 2 Figure 1 is a longitudinal section of a heating f elongated cross section with substantially flat,

i heat toliquids passing along the exterior surface through the tubular members `3,' 4 may `take place in any suitable manner, such as by welding, screwthreaded bolts or` the like, not illustrated` on the drawing. Also the connection of the set, of pressure steam tubes `with the'v steam inlet opening 5 and outlet opening 'rn'ay take place in any conventionall manner, suitable packings ben ing provided for preventing leakage of pressure steam. i Y

As indicated on Figure 2 the pressure resisting casing 1 may be made in two halves, which can `be easily separated in order to obtain access lto the heating tubes. y

Each heating tube isprovided with interior longitudinal ribs 7 extending between'the parallel 70 side surfaces and serving to reinforce the same against exterior pressure. One, two or more such ribs may be provided for each pressure tube,

although under ordinary circumstances it is preferred to have two ribs inside each pressure tube and in the spaces betweenthe pressure tubes as well as between thev outer pressure tubes and the interior side walls of the pressure resisting casing.

In accordance with the embodiment of the invention illustrated by the crossV sectional view of' Figure 3 the pressure resisting casing 1Y has a cylindrical shape and is provided in its interior with two iiat surfaces, 9, 10 parallel to and adjacent the exterior surfaces of the outer steam pressure tubes. The ribs 7, 8 on the embodimentv illustrated on Figure 3 are located in staggered relation to each other, although the lines of contact between the ribs engaging the inside and outside of one ilat side wall should not be too far apart, as each rib should be adapted to transmit pressure exerted by another rib engaging theopposite side of the same surface. Y

I claim: i

1. A heating device for the transmission of heat to liquids passing along the exterior surface of pressure steam tubes comprisingva numberof pressure steam tubes with substantially flat paral- Y lel side surfaces located adjacent to each other, a pressure resisting casing enclosing saidrtubes, longitudinal ribs extending between said parallel side surfaces inside said tubes and longitudinal ribs extending betweenopposed surfaces on adjacent tubes aswell asbetween the two outer tubes and the interiorfwall of the pressureresisting casing. l

2. A heating device for the transmission of of pressure steam tubes comprising a number of f as between the two outer tubes and the interior pressure steam tubes with substantially fiat parallel side surfaces located adjacent each other, a pressure resistingy casing enclosing said tubes, longitudinal ribs extending between said parallel Vside surfaces inside said tubes and being secured by welding to one of said surfaces and longitudinal ribs extending between opposed surfaces on adjacent tubes as well as between the two outer tubes and the interior. wall ofthe pressure resisting casing. -1 v. n

3. A heating device for the transmission of heat to liquids passing along the exterior surface of pressure steam tubes comprising a number of Wall of ther pressure kresisting casing.

4. A heating device for the transmission of heat to liquidspassing along the exterior surface of pressure steam tubes comprising a number of pressure steam tubes with substantially flat par- Ario allel side surfaces located adjacenteach other, a pressure resisting casing having a circular cross section enclosing said tubes, longitudinal ribs extending between said parallel side surfaces inside said tubes and longitudinal ribs extending between opposed surfaces on adjacent tubes as well as between the two outer tubes and the interior Wall of the pressure resisting casing, said longitudinalribs; being located in staggered relation to each other.

5. VA heating device for the transmission of heat to liquids passing along the exterior surface of pressure steam tubes comprising a number of pressureA steam tubes with substantially flat parallel side surfaces located adjacent each other, a pressure resisting casing having a circular cross section enclosing said tubes, longitudinal ribs extending between said parallel side surfaces inside said tubes and longitudinal ribs extending between opposed surfaces on adjacent tubes as well as between the two outertubes and the interior wall of the pressure resisting casing, said pressure resisting casing having substantially at interior surfaces parallel with and adjacent the two outer tubes. f

v KRISTFFER MORTERUD. 

